M2 Lesson 11 Review

Multiplication 1

300

1a. Estimate first.

2.42 x 12

29.04

400

1b. Estimate first.

4.13 x 37

152.81

500

2a. Estimate first. 

2.03 x 13

26.39

Multiplication 2

300

2b. Estimate first. 

53.16 x 34

1807.44

400

2c. Estimate first. 

371.23 x 53

19675.19

500

2d. Estimate first. 

1.57 x 432

678.24

Place Value

300

3a. If 36 x 134 = 4824 

then, 36 x 1.34 = ? 

Explain how you know.

48.24

134 is divided by 100 (decimal point moved two to the left) to get to 1.34. 

Therefore, I also moved the decimal to the left two spaces on 4824 and got 48.24

400

3b. If 84 x 2674 = 224616

then, 84 x 26.74 = ? 

Explain how you know.

2246.16

2674 is divided by 100 (decimal point moved two to the left) to get to 26.74. 

Therefore, I also moved the decimal to the left two spaces on 224616 and got 2246.16

500

3c. If 19 x 3211 = 61009

then, 321.1 x 19 = ? 

Explain how you know.

6100.9

3211 is divided by 10 (decimal point moved one to the left) to get to 321.1 

Therefore, I also moved the decimal to the left one space on 61009 and got 6100.9